For subtracting the IR singularities of the renormalized 1-loop amplitude \(\mathcal {A}^{[\text{1-loop,R}]}_{eeQQ}\) ,
we use the antenna subtraction method [1]}, [2]}.
The antenna subtraction term needed here reads [3]}:
\(\Big |\mathcal {A}^{[\text{IR}]}_{eeQQ} \Big \rangle &=&\frac{\alpha _s}{4 \pi } \bar{C}( \epsilon )\mathcal {A}^0_3\left(\epsilon , \frac{\mu _{DR}^2}{s}; y \right)\mathcal {A}^{[\text{tree}]}_{eeQQ}(1_{e^-}, 2_{e^+}, 3_{Q}, 4_{\bar{Q}}) ~2\mathrm {C}_F \delta _{i_3 i_4}+ \mathcal {O}(\alpha _s^2),\) 
